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Just unsrew the platen that holds the OMAS, unclip the brown clip holding the cable. Then connect the the new OMAS which comes with the platen preassembled and fit it into the print platen. Do not try to calibrate the OMAS, it won’t work and it is not necessary.

OMAS glas should look shiny blue, not greyed. I would replace it cause everything points to this tracking sensor. The drive roller encoder is not easy to access fully, because you need to remove iss and cartridge holder.

Check out if your inks are expired. This will make pigments settling to bottom of your cartridge making the ink color completely random.

If ink drips through printhead while filling it could be a clogged meniscus filter.

Not the heaters, but the chamber inside and the perforated plate.

Check and clean contact of interconnect pca. Replace the printhead. Swap interconnect pca with a different color and verify if problem is moving with the pca.

I guess you have Problem with your Meniskusfilter in the carriage. Check and replace if necessary. Check also the 3-way-valve in the ink bay, which controls the recirculation. Could be that ink is filled instead of recircled. The adjuster valves are meant to control air flow when pressurizing...

Check and reduce input tension. Is there a lot of debris on the drive roller making the substrate slipping?

I would go and Disconnect all ink supplies regarding optimizer and open the ink pump, clean the membrane and flip it before reassembling.

You’ve missed the log file…

I would also go for the firewire cable which is transferring the data from the datarelay to the carriage pba. If you could provide the machine logs it can easily be checked.

Check resistance of heater element in each curing module. You can also swap them and check if position-code varies. The second error code can be a result of the first code thrown.

But the fact that you reassembled it means you bought just a naked chinese belt. And yes the tension is poor.

Have you re-mounted the black plastic stopper on right hand? The original belt comes preassembled correctly. On the u-bracket you have to holes. The round shaped should be on the bottom pin. If the encoder is correctly mounted there should be a gap of about one millimeter to the bracket corner.

You’re right. Should use my goggles… Anyway, I would increase curing and reduce drying temperature.

Curing of 120% ink plus 35% OP at 185F in 6 pass won’t work well. I would reduce OP to 25%, set curing to 200F and reduce drying to 140F.

The issue with printmech/primer valve I had too. But to get this issue resolved the diagnostic is running quite to short. My way is to use a pressure gauge and inflate the system using a syringe. Kink every tube until pressure stays stable or kink all tubes and release one after the other...

The lucky thing about these units is that you can replace each part on your own. Maybe you need some advice by phone, but it reduces costs when a repair is needed.

If you order the OMAS it will include the cable card

You can run the OP depletion testprint to get a visible result on OP stability